Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/pillow-10.4.0-py3.8-linux-x86_64.egg/PIL/FpxImagePlugin.py: 2%

1# 

2# THIS IS WORK IN PROGRESS 

3# 

4# The Python Imaging Library. 

5# $Id$ 

6# 

7# FlashPix support for PIL 

8# 

9# History: 

10# 97-01-25 fl Created (reads uncompressed RGB images only) 

11# 

12# Copyright (c) Secret Labs AB 1997. 

13# Copyright (c) Fredrik Lundh 1997. 

14# 

15# See the README file for information on usage and redistribution. 

16# 

17from __future__ import annotations 

18 

19import olefile 

20 

21from . import Image, ImageFile 

22from ._binary import i32le as i32 

23 

24# we map from colour field tuples to (mode, rawmode) descriptors 

25MODES = { 

26 # opacity 

27 (0x00007FFE,): ("A", "L"), 

28 # monochrome 

29 (0x00010000,): ("L", "L"), 

30 (0x00018000, 0x00017FFE): ("RGBA", "LA"), 

31 # photo YCC 

32 (0x00020000, 0x00020001, 0x00020002): ("RGB", "YCC;P"), 

33 (0x00028000, 0x00028001, 0x00028002, 0x00027FFE): ("RGBA", "YCCA;P"), 

34 # standard RGB (NIFRGB) 

35 (0x00030000, 0x00030001, 0x00030002): ("RGB", "RGB"), 

36 (0x00038000, 0x00038001, 0x00038002, 0x00037FFE): ("RGBA", "RGBA"), 

37} 

38 

39 

40# 

41# -------------------------------------------------------------------- 

42 

43 

44def _accept(prefix: bytes) -> bool: 

45 return prefix[:8] == olefile.MAGIC 

46 

47 

48## 

49# Image plugin for the FlashPix images. 

50 

51 

52class FpxImageFile(ImageFile.ImageFile): 

53 format = "FPX" 

54 format_description = "FlashPix" 

55 

56 def _open(self): 

57 # 

58 # read the OLE directory and see if this is a likely 

59 # to be a FlashPix file 

60 

61 try: 

62 self.ole = olefile.OleFileIO(self.fp) 

63 except OSError as e: 

64 msg = "not an FPX file; invalid OLE file" 

65 raise SyntaxError(msg) from e 

66 

67 if self.ole.root.clsid != "56616700-C154-11CE-8553-00AA00A1F95B": 

68 msg = "not an FPX file; bad root CLSID" 

69 raise SyntaxError(msg) 

70 

71 self._open_index(1) 

72 

73 def _open_index(self, index: int = 1) -> None: 

74 # 

75 # get the Image Contents Property Set 

76 

77 prop = self.ole.getproperties( 

78 [f"Data Object Store {index:06d}", "\005Image Contents"] 

79 ) 

80 

81 # size (highest resolution) 

82 

83 self._size = prop[0x1000002], prop[0x1000003] 

84 

85 size = max(self.size) 

86 i = 1 

87 while size > 64: 

88 size = size // 2 

89 i += 1 

90 self.maxid = i - 1 

91 

92 # mode. instead of using a single field for this, flashpix 

93 # requires you to specify the mode for each channel in each 

94 # resolution subimage, and leaves it to the decoder to make 

95 # sure that they all match. for now, we'll cheat and assume 

96 # that this is always the case. 

97 

98 id = self.maxid << 16 

99 

100 s = prop[0x2000002 | id] 

101 

102 bands = i32(s, 4) 

103 if bands > 4: 

104 msg = "Invalid number of bands" 

105 raise OSError(msg) 

106 

107 # note: for now, we ignore the "uncalibrated" flag 

108 colors = tuple(i32(s, 8 + i * 4) & 0x7FFFFFFF for i in range(bands)) 

109 

110 self._mode, self.rawmode = MODES[colors] 

111 

112 # load JPEG tables, if any 

113 self.jpeg = {} 

114 for i in range(256): 

115 id = 0x3000001 | (i << 16) 

116 if id in prop: 

117 self.jpeg[i] = prop[id] 

118 

119 self._open_subimage(1, self.maxid) 

120 

121 def _open_subimage(self, index: int = 1, subimage: int = 0) -> None: 

122 # 

123 # setup tile descriptors for a given subimage 

124 

125 stream = [ 

126 f"Data Object Store {index:06d}", 

127 f"Resolution {subimage:04d}", 

128 "Subimage 0000 Header", 

129 ] 

130 

131 fp = self.ole.openstream(stream) 

132 

133 # skip prefix 

134 fp.read(28) 

135 

136 # header stream 

137 s = fp.read(36) 

138 

139 size = i32(s, 4), i32(s, 8) 

140 # tilecount = i32(s, 12) 

141 tilesize = i32(s, 16), i32(s, 20) 

142 # channels = i32(s, 24) 

143 offset = i32(s, 28) 

144 length = i32(s, 32) 

145 

146 if size != self.size: 

147 msg = "subimage mismatch" 

148 raise OSError(msg) 

149 

150 # get tile descriptors 

151 fp.seek(28 + offset) 

152 s = fp.read(i32(s, 12) * length) 

153 

154 x = y = 0 

155 xsize, ysize = size 

156 xtile, ytile = tilesize 

157 self.tile = [] 

158 

159 for i in range(0, len(s), length): 

160 x1 = min(xsize, x + xtile) 

161 y1 = min(ysize, y + ytile) 

162 

163 compression = i32(s, i + 8) 

164 

165 if compression == 0: 

166 self.tile.append( 

167 ( 

168 "raw", 

169 (x, y, x1, y1), 

170 i32(s, i) + 28, 

171 (self.rawmode,), 

172 ) 

173 ) 

174 

175 elif compression == 1: 

176 # FIXME: the fill decoder is not implemented 

177 self.tile.append( 

178 ( 

179 "fill", 

180 (x, y, x1, y1), 

181 i32(s, i) + 28, 

182 (self.rawmode, s[12:16]), 

183 ) 

184 ) 

185 

186 elif compression == 2: 

187 internal_color_conversion = s[14] 

188 jpeg_tables = s[15] 

189 rawmode = self.rawmode 

190 

191 if internal_color_conversion: 

192 # The image is stored as usual (usually YCbCr). 

193 if rawmode == "RGBA": 

194 # For "RGBA", data is stored as YCbCrA based on 

195 # negative RGB. The following trick works around 

196 # this problem : 

197 jpegmode, rawmode = "YCbCrK", "CMYK" 

198 else: 

199 jpegmode = None # let the decoder decide 

200 

201 else: 

202 # The image is stored as defined by rawmode 

203 jpegmode = rawmode 

204 

205 self.tile.append( 

206 ( 

207 "jpeg", 

208 (x, y, x1, y1), 

209 i32(s, i) + 28, 

210 (rawmode, jpegmode), 

211 ) 

212 ) 

213 

214 # FIXME: jpeg tables are tile dependent; the prefix 

215 # data must be placed in the tile descriptor itself! 

216 

217 if jpeg_tables: 

218 self.tile_prefix = self.jpeg[jpeg_tables] 

219 

220 else: 

221 msg = "unknown/invalid compression" 

222 raise OSError(msg) 

223 

224 x = x + xtile 

225 if x >= xsize: 

226 x, y = 0, y + ytile 

227 if y >= ysize: 

228 break # isn't really required 

229 

230 self.stream = stream 

231 self._fp = self.fp 

232 self.fp = None 

233 

234 def load(self): 

235 if not self.fp: 

236 self.fp = self.ole.openstream(self.stream[:2] + ["Subimage 0000 Data"]) 

237 

238 return ImageFile.ImageFile.load(self) 

239 

240 def close(self) -> None: 

241 self.ole.close() 

242 super().close() 

243 

244 def __exit__(self, *args: object) -> None: 

245 self.ole.close() 

246 super().__exit__() 

247 

248 

249# 

250# -------------------------------------------------------------------- 

251 

252 

253Image.register_open(FpxImageFile.format, FpxImageFile, _accept) 

254 

255Image.register_extension(FpxImageFile.format, ".fpx")